66419216 has 40 divisors (see below), whose sum is σ = 135687744. Its totient is φ = 31433600.

The previous prime is 66419209. The next prime is 66419233. The reversal of 66419216 is 61291466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36275 + ... + 38061.

Almost surely, 2^66419216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66419216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67843872).

66419216 is an abundant number, since it is smaller than the sum of its proper divisors (69268528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66419216 is a wasteful number, since it uses less digits than its factorization.

66419216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1913 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 66419216 is about 8149.7985251170. The cubic root of 66419216 is about 404.9778294016.

The spelling of 66419216 in words is "sixty-six million, four hundred nineteen thousand, two hundred sixteen".